Authorities in southern India have told residents in coastal areas to evacuate, warning that there could be fresh tidal waves.

"We have issued an alert. There could be a wave attack in the next hour," said Veera Shanmuga Mani, the top administrator in Nagappattinam, a coastal town in southern Tamil Nadu state where most of the deaths from the weekend tsunamis occurred.

It was unclear what sparked the warning, but two aftershocks have hit islands off of India's eastern coast, the Indian Meteorological Department said earlier.

A moderate earthquake, measuring 5.2 on the Richter scale, struck the Greater Nicobar island.

Two hours later, another earthquake of the same intensity hit the Little Nicobar island.

Mani said people living within two miles from the coastline had been asked to evacuate the area.

Thousands of residents in Nagappattinam began fleeing the town as the warning came in.

Police ordered hundreds of vehicles carrying relief supplies and rescue workers not to enter the town.

No other details were immediately available.

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